Catalyst for selective catalytic reduction of nitrogen oxide in moderate/low temperature environment

A low-temperature environment, nitrogen oxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical/physical process, etc., can solve the problem of high catalyst cost, narrow catalyst temperature activity window, Poor thermal stability and other problems, to achieve the effect of easy to obtain raw materials, simple use conditions and low cost of raw materials

Inactive Publication Date: 2011-09-14
JILIN UNIV
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  • Abstract
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Problems solved by technology

However, there are still some problems in the practical application of this technology: first, the cost of the catalyst is relatively high; second, vanadium pentoxide itself is a poisonous substance; third, the temperature activity window of the catalyst is narrow. x The conve

Method used

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  • Catalyst for selective catalytic reduction of nitrogen oxide in moderate/low temperature environment
  • Catalyst for selective catalytic reduction of nitrogen oxide in moderate/low temperature environment
  • Catalyst for selective catalytic reduction of nitrogen oxide in moderate/low temperature environment

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Example

[0020] Examples 1 to 4:

[0021] Weigh 8g of TiO with a single anatase phase in the particle size range of 30-40nm 2 Powder, mix and stir with 40ml deionized water to make TiO 2 Mix well with water to get TiO 2 Slurry. Weigh 2.54g of hydrated ammonium tungstate and dissolve it in 30ml solution containing 5g of oxalic acid, heat it until all hydrated ammonium tungstate is dissolved and then add it to TiO 2 In the slurry, continue to stir for 2 hours, then continue to stir and evaporate to dryness in a water bath at 90°C until the mixture becomes viscous, then take it out and place it in an oven to dry at 120°C, grind to 80-100 mesh, and then place it in the air It was calcined at 500°C for 5 hours, and after the muffle furnace was naturally cooled to room temperature, it was taken out and ground to 80 mesh to 100 mesh to obtain 10.34g WO 3 / TiO 2 Vector, of which WO 3 With TiO 2 The molar ratio is 0.1:1, expressed as WO 3 (0.1) / TiO 2 .

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Abstract

The invention belongs to the field of end gas decontamination of diesel cars, and in particular relates to a MnOx-Wo3/TiO3 catalyst for selective catalytic reduction of nitrogen oxide, which is used for treating NOx in the end gas of diesel cars in moderate/low temperature environment (120-300 DEG C) and prepared by an immersion method. The catalyst adopts a common metal oxide MnOx as an active component, the raw materials are low-cost and easily obtained, the use condition is simple, and the catalyst can be mass produced. The catalyst disclosed by the invention can be used for catalyzing ammonia selective reduction nitric oxides to be harmless nitrogen and water in the low temperature environment of 120 DEG C, and the high conversion rate of the catalyst can be kept at about 300 DEG C.

Description

technical field [0001] The invention belongs to the field of purification of diesel vehicle exhaust, in particular to a method for treating NO in diesel vehicle exhaust in a medium and low temperature environment (120°C-300°C). x A catalyst for the selective catalytic reduction of nitrogen oxides. Background technique [0002] In recent years, motor vehicle exhaust is one of the most serious sources of pollution. Due to the extensive use of buses and diesel trucks in large cities, the pollution is very serious. According to research reports from international authoritative organizations, among the 150 large cities in the world, Beijing in my country Air pollution in five major cities, Shanghai, Guangzhou, Xi'an, and Shenyang ranks among the top 10. It is urgent to carry out research on diesel engine exhaust purification technology and catalyst development. Exhaust emissions from diesel vehicles are mainly NO x (mainly NO) and soot (PM), CO and HC emissions are significantly...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/94B01D53/56
Inventor 韩炜张克金彭悦张苡铭曹雅彬张贺韩建周亮
Owner JILIN UNIV
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